Kotoneiro

Akito wants more than the safe, undefined thing he's had with his childhood friend Koto-nee since forever, but he can't quite say so out loud. So Koto-nee names her price instead: join the club and stay a regular, and she'll grant him one wish.

That deal is the whole hook. What starts as a harmless favor turns into Akito trying to hold onto Koto-nee while other pressures, other men, other choices, work against him, with the story branching toward more than one ending depending on how he handles it.

Play is visual-novel reading and choice-picking, watching a spring-break arrangement curdle or deepen depending on what Akito does with his one wish and how much he's willing to look away from. The voiced scenes and school setting keep it grounded rather than fantastical, and the cheating and netorare threads mean the "good" ending isn't guaranteed just because you want it.